“Poisonous—often confused with venomous—means a plant, animal, or substance capable of causing death or illness if taken into the body. Venomous means capable of injecting venom. A rattlesnake is not itself poisonous, because if you eat one it won’t poison you. A blowfish will kill you if you eat it, so it is poisonous, but not venomous.”

This is number six in Laura Hale Brockway’s list of “8 words that may not mean what you think they mean” on PR Daily. And it’s true that poisonous may not mean what you think it means, but this also implies that it may mean exactly what you think it means, and as it turns out, it does.

Though this was the first time I heard this complaint, it turns out to be mildly common. Paul Brians mentions it in his common errors — in fact, Brockway seems to have lifted half of her complaint from his. You can find a number of other onlineobjectors, of course, but it’s uncommon in printed usage guides; of the seven within my reach at the moment, only Ambrose Bierce’s Write It Right complains about poisonous.

Conveniently, my edition of Write it Right is Jan Freeman’s excellent centennial edition, which means that each of Bierce’s complaints is accompanied by her research into it. About this issue, she writes:

“As usual, Bierce would like to fence the overlapping words into separate pens. But while venomous does describe rattlesnakes and other animals that poison victims with a bite or sting, poisonous has always been a broader term. Samuel Johnson knew both words, but in his Dictionary (1755) he referred to ‘a poisonous serpent,’ ‘a poisonous insect,’ and ‘a poisonous reptile.'”

It’s not just Johnson, either. The Oxford English Dictionary cites The Indian Queen, a play by Robert Howard and John Dryden (he of “no final prepositions” fame), with “poisonous Vipers” in 1665. Google Books can supply you a vast array of hits for “poisonous snakes” from the 1800s, if you need convincing of the lineage. Here’s my favorite, as it’s very clearly talking about snakes with venomous bites; it’s written by someone studying the venom of the snakes, so this isn’t some casual imprecise usage but the considered usage of a professional; and it’s from 1839, so there’s no arguing that this is some sloppy modern usage.

In short, the two words do not have distinct meanings; rather, one has a subset of the other’s. This is common in English; I’ve previously written about jealousy/envy, verbal/oral, and compose/comprise, all of which display this to some degree.

In the case of venomous and poisonous, this oughtn’t to be surprising, as their stems have this same relationship. A venom is one kind of poison, and similarly, being venomous is one way that an animal can be poisonous. The biggest clue that we aren’t all wrong for using poisonous in place of venomous is that it’s very rare to see the opposite extension. When people talk about “venomous plants”, for instance, they’re usually talking about plants that literally do sting, like stinging nettles or the gympie gympie. If people are just stupid or underinformed, they ought to make their errors symmetrically; here, the supposed error really only goes one way. (I’d expect asymmetric errors if one were much rarer than the other, but venomous isn’t particularly rare.)

So poisonous and venomous overlap in general usage, and I’m having trouble seeing why anyone would expect or even want them to be separated. The only situation where it would potentially be worth having distinct definitions is if you’re regularly dealing with things that contain poisons delivered by different methods. But if that’s the goal, poisonous and venomous don’t supply enough categories. Having poisonous describing anything but venomous is just strange, given that it doesn’t make presumably critical distinctions between the poisoning methods of, say, tree frogs (touch) and pufferfish (ingestion).

Summary:Poisonous and venomous aren’t totally distinct. It’s fine to call a snake poisonous, even if it’s its venom that’s dangerous. But it’s rare (and generally incorrect) to call something with a non-venom poison venomous. This is how it has been for hundreds of years in English. Objections to the subset relationship between poisonous and venomous are pretty rare, and outside of specialized contexts, pretty unfounded.

I can’t think of a time I’ve seen it used to mean anything other than “previously decided” or “debatable only as an academic exercise”. And yet I’ve recently been encountering people claiming that this is wrong, wrong, WRONG, and that moot in fact means quite the opposite: a point that is open for meaningful debate. A representative example of this claim from the recent “20 Common Grammar Mistakes that (Almost) Everyone Makes” article*:

“Contrary to common misuse, ‘moot’ doesn’t imply something is superfluous. It means a subject is disputable or open to discussion. e.g., The idea that commercial zoning should be allowed in the residential neighborhood was a moot point for the council.”

Of course, if (almost) everyone misuses a word the same way, then it’s probably not a misuse. But setting that point aside, if moot really means the opposite of how it’s normally used, how could that have happened?

Let’s start the answer by noting that non-American English speakers might be wondering what I’m going on about. It seems that moot means something different depending on which side of the Atlantic it’s being used on. A little history: the OED reports that adjectival moot arose in legal parlance to describe hypothetical cases used as practice for law students. Thus the earliest meaning of moot referred to a debate without practical consequences, whether because the case was hypothetical or because it was a real case that had already been decided.**

Between the emergence of adjectival moot in the 1500s and modern times, its meaning spread out in two directions. One is that of American English: a point that is unrelated to law, is debatable, and whose debate has no practical consequences. Whether I should have been so enamored of The Juliana Theory’s “Into the Dark” when it was on heavy radio rotation in 2000 is a moot point, because I can’t go back and tell my younger self that the song was maudlin emo crap. But it’s also a debatable topic, because my interest in that song got me to seek out their album, which had better songs and which later led me to find out about a split EP containing Dawson High’s song “Port Matilda”, which had a huge influence on my artistic sensibilities throughout college. Points can be made on either side, but the decision can’t change.

The other direction in which moot spread was to a point that was just generally open for debate, whether or not it had practical consequences. This is what’s being claimed above to be the “correct” meaning, but here the author’s running afoul of our curious American tendency to confuse the British usage (which is what it is) for the correct usage. In my experience with American English, it’s at least the much less common meaning if not non-standard.

Of course, the two meanings are not very far apart. A point that some of the complainants overlook about the American meaning is that while the debate doesn’t matter, the point is still debatable. Sometimes it may not feel this way; Lynne Murphy cites an old Saturday Night Live sketch “The Question is Moot”, where Jesse Jackson is a game show host who repeatedly interrupts his contestants’ answers by declaring that the question is moot — i.e., unworthy of debate or speculation.

But this, crucially, does not mean that it could not be debated. It doesn’t work for points that are settled and beyond debate. Don’t these sentences sound strange?

(1a) ?Whether cats built the Sphinx is a moot point.
(1b) ?It’s a moot point whether Wayne’s World inspired Bridge Over the River Kwai.***

There is one sense of moot that I haven’t touched on yet. Looking through COCA, I found this example:

“It shrank a bit, though its generous size should make the reduction moot.”

This seems to be a recently emerging meaning, for an undeniable but negligible matter. As far as I know, this is limited to predicative usages (e.g., the reduction was moot but not *the moot reduction). And maybe that’s what all this fuss is about, but I don’t think so.

Lastly, the word is moot, not mute. The standard pronunciation rhymes with boot. The pronunciation may be slowly moving toward mute, but at the moment, rhymes-with-boot is the dominant pronunciation in Standard American English.

**: If we consider the nominal moot as well, it goes back to Old English and could refer to a non-hypothetical court as well; a moot was any assembly of people, but especially one with judicial purposes. The OED notes that this usage persists, but I think it has to be restricted to British (or at least non-American) Englishes, because all the contemporary occurrences sound like nonsense to me.

***: In case you worry that the oddness of these sentences stems from the oddness of their topics, compare with That cats built the Sphinx is an idiotic notion, which sounds fine to me.

I’m a little surprised that I’ve been blogging for almost five years now and never got around to talking about whether there’s a difference between the words disinterested and uninterested. I suppose I’ve avoided it because the matter has already been excellently discussed by manyothers, and I didn’t think I needed to add my voice to that choir. But now it’s become something of a glaring omission in my mind, so it’s time to fix that.

Let’s skip to the end and fill in the middle later: there is a difference, but in Mark Liberman’s words, it’s “emergent and incomplete, rather than traditional and under siege”. For some people, there’s a clean separation, for others an overlap. In the language in general, uninterested is limited to the “unconcerned” meaning, while disinterested can mean either “unconcerned” or “unbiased”.

How do two distinct meanings arise from such similar words? The problem lies at the root — namely, interest, which can be with (1a) or without (1b) bias:

(1a) I espouse a relatively dull orthodox Christianity and my interest in Buddhism is strictly cultural, aesthetic.
(1b) Upon consignment of your car, it’s in my interest to do everything possible to present your car to potential buyers.

So, when one adds a negative prefix to interest(ed), is it merely disavowing concern, or bias as well? I don’t know of any inherent difference between dis- and un- that would solve that question, and historically, no one else seemed to either. Though I don’t have relative usage statistics, the Oxford English Dictionary cites both forms with both meanings early in their history:

(2a) How dis-interested are they of all Worldly matters, since they fling their Wealth and Riches into the Sea. [c1677-1684]
(2b) The soul‥sits now as the most disinterested Arbiter, and impartial judge of her own works, that she can be. [1659]

(2c) He is no cold, uninterested, and uninteresting advocate for the cause he espouses. [1722]
(2d) What think you of uninterested Men, who value the Publick Good beyond their own private Interest? [1709]

But we both know that it’s no longer the 18th century, and I strongly suspect that you find (2d) to be a bit odd. The OED agrees, and marks this meaning (uninterested as “unbiased”) as obsolete. I looked over the first 50 examples of uninterested in COCA (Corpus of Contemporary American English) as well and found no examples like (2d). If it still exists, it’s rare or dialectal. Uninterested meaning “unconcerned” (2c) is, of course, alive and well.

So really, it’s not a question of whether people are confusing uninterested and disinterested, but rather a question of whether disinterested has two possible meanings. We’re certainly told that they are, and that it is imperative that disinterested be kept separate. For instance:

“The constant misuse of disinterested for uninterested is breaking down a very useful distinction of meaning.”

Is it really? Suppose disinterested could just as easily take either meaning, and that this somehow rendered it unusable.* You’d still be able to use unbiased, impartial, objective, or unprejudiced for the one meaning, and indifferent, unconcerned, and uninterested for the other. We’re not losing this distinction at all.

Setting aside such misguided passion, let’s look at how disinterested actually is (and has been) used. As we saw in (2a) & (2b), disinterested started out being used for both meanings. This persisted, according to the Merriam-Webster Dictionary of English Usage (MWDEU), through the 19th century without complaint. Noah Webster’s 1828 American Dictionary disinterestedly lists both senses, and it’s not until 1889 that MWDEU finds the first complaint. Opposition to disinterested for “unconcerned” appears to have steadily grown since then, especially in America.

But despite all the grousing, “unbiased” disinterested is hardly in dire straits. MWDEU’s searches found that 70% of all uses of disinterested in their files between 1934 and the 1980s were of this sense, and that this percentage actually increased during the 1980s. Furthermore, the MWDEU notes that the use of disinterested for “unconcerned” usually has a subtle difference from uninterested. Disinterested is often used to indicate that someone has lost interest as opposed to having been uninterested from the start.** This fits with other un-/dis- pairs, such as unarmed/disarmed.

Summary: Far from losing an existing distinction, it seems that we’re witnessing a distinction emerging. Uninterested is now restricted to an “unconcerned” meaning. Disinterested covers impartiality, but it also can take the “uninterested” meaning, often indicating specifically that interest has been lost. Because many people object to this sense of disinterested, you may want to avoid it if you’re uninterested in a fight. Will the distinction ever fully emerge, and the overlap be lost? Would that this desk were a time desk…

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*: I think it goes without saying that having multiple meanings does not make a word unusable. In case it doesn’t, consider the much more confusing words fly, lead, and read.

**: Compare, for instance, I grew disinterested to I grew uninterested. I definitely prefer the former.

**: MWDEU notes that while the distributions of the two senses overlap, it’s more clear than people let on; “unbiased” disinterested tends to modify an abstract noun like love, whereas “unconcerned” disinterested tends to modify humans, and appear with in in tow.

To a linguist, there is an obvious difference between verbal and oral: only the first word can be used to mean “pertaining to a verb”. But for people who don’t talk about parts of speech so often, the more relevant question is whether verbal can refer to spoken language (as opposed to written language), or if it can only refer to the more general sense of all language:

(1a) The written warning is primarily the verbal warning put in writing […]
(1b) […] generalverbal skills, such as verbal fluency, ability to understand and use verbal reasoning, and verbal knowledge.

Some people insist that verbal can’t be used as in (1a). Verbal is derived from the Latin verbum, meaning “word”, and that means that it only distinguishes things involving words from things not involving words. This is the usage in (1b), where verbal reasoning is implicitly differentiated from mathematical reasoning, or spatial reasoning, or any other form of reasoning that is not based in words. Clearly this is a valid usage of verbal.

And, while we’re at it, we can quickly agree that oral would be inappropriate for the usage in (1b). “Oral knowledge”, for instance, is specifically knowledge that is spoken aloud, and I really can’t see that being the intended meaning. I think we can also all agree that oral is definitely appropriate for the usage in (1a). So what we have a is 2×2 chart, with three of the values filled in:

using words

spoken

verbal

YES (1b)

? (1a)

oral

NO (1b)

YES (1a)

The only remaining question is whether verbal is allowable in that last cell, with the meaning “spoken”. And the answer is yes, and it has been almost since verbal‘s first appearance in English. The Oxford English Dictionary first attests verbal in 1483, but at that point it modifies people. William Caxton writes:

“We beverbal, or ful of wordes, and desyre more the wordes than the thynges.”

The first attestation of verbal meaning “composed of words” comes between 50 and 100 years later, in either 1530 or 1589.* And the first attestation of verbal meaning “conveyed by speech” comes in 1617:

“The Chamber of the Pallace where verball appeales are decided […]”

This meaning has persisted. I looked at the Corpus of Historical American English (COHA) for the most common nouns to follow verbal over the past 200 years. The two most common collocates were communication and expression, each with 43 hits. Unfortunately, looking at the contexts in which these were used, it’s hard for me to tell which meaning was intended. But the third most common collocate, message, appears 40 times, spread out over the past two centuries. And these are pretty unambiguously examples of the “spoken” meaning, because it’s rare that you’d need to distinguish message delivered in words from those that aren’t. For instance:

“His reply was this verbal message: ‘Wait — and trust in God!'” [1875]
“The verbal message is the key to the written one.” [1909]

I don’t have numbers on the relative usage of the two meanings of verbal, so I’m not going to try to say that one is more common than the other. But it is pretty clear that the “conveyed by speech” meaning is valid.

Does this acceptability mean that you should unquestioningly use it in this way? Not necessarily; there is a potentially significant ambiguity here, so it’s not the best choice in all situations. On occasion, it will matter whether verbal means “conveyed by speech” or “involving words”. If I write to a tutor and ask them to improve my verbal skills, it may be ambiguous as to whether I’m looking for instruction in public speaking or vocabulary building. That’s a trivial example, but in legal contexts, it’s probably better to refer to oral contracts, warnings, etc. than verbal ones, just to avoid the ambiguity.

In most cases, where this ambiguity is small or unimportant, you can and should use whichever feels better to you. You can freely swap between the two meanings in different contexts, as I do. A lot of the time, the context (especially what noun verbal is modifying) will clarify things. So in the end, our chart becomes:

using words

spoken

verbal

YES

YES

oral

NO

YES

Summary:Verbal can refer either to anything delivered in words or something that is specifically spoken. This latter usage is sometimes condemned as modern sloppiness, but it’s been persistently attested for 400 years. The ambiguity is generally not sufficient to be problematic, so it’s only in cases where precision is paramount that the latter usage should be avoided.

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*: The 1530 attestation is listed under this definition, but its usage seems to me identical to Caxton’s usage, modifying people. The 1589 attestation is unambiguously referring to language, referring to “verbale sermons”.

About The Blog

A lot of people make claims about what "good English" is. Much of what they say is flim-flam, and this blog aims to set the record straight. Its goal is to explain the motivations behind the real grammar of English and to debunk ill-founded claims about what is grammatical and what isn't. Somehow, this was enough to garner a favorable mention in the Wall Street Journal.

About Me

I'm Gabe Doyle, currently a postdoctoral scholar in the Language and Cognition Lab at Stanford University. Before that, I got a doctorate in linguistics from UC San Diego and a bachelor's in math from Princeton.

In my research, I look at how humans manage one of their greatest learning achievements: the acquisition of language. I build computational models of how people can learn language with cognitively-general processes and as few presuppositions as possible. Currently, I'm working on models for acquiring phonology and other constraint-based aspects of cognition.

I also examine how we can use large electronic resources, such as Twitter, to learn about how we speak to each other. Some of my recent work uses Twitter to map dialect regions in the United States.